Fog thins more quickly than expected

Figure 1 – Courtesy of the Met Office

I don’t know exactly why, but the fog that formed well before midnight across southern areas (fig 2), thinned quite quickly from many places in the second part of the night (fig 3). There certainly was a little more in the way of low cloud north of Birmingham later in the night, and the gradient may have picked up across other areas, but it’s now quite patchy across southern England at dawn, and in some areas such as the southwest of England and east of London, fog was reluctant to form at all. The thinning may have had something to do with warmer air aloft advecting up from the southwest and permeating down to lower levels, I notice for example that the temperature difference between Dunkeswell (252 M amsl) and Exeter airport (27 M amsl) at 09 UTC here in Devon was 6.2°C.

Figure 2
Figure 3

Certainly the earlier yellow warning of fog which lapsed at 06 UTC was quite accurately forecast by the Met Office (fig 4).

Figure 4 – Courtesy of Twitter

Author: xmetman

An ex-metman passionate about all things to do with weather, climate and clouds

2 thoughts on “Fog thins more quickly than expected”

  1. I have just noticed that the MO did forecast fog here today, but I don’t think there was any.
    Also they forecasted a temp. of only 6 c for now, but already its 8.9c.

  2. The fog seemed to “come out of the blue”, or it just might have been me not paying attention.
    How much warning was there, I can’t see when the warnings were issued – I am sure that they used to tell you but I can’t find that information anywhere.
    No fog on the NE coast for some time.

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